Tom Brady's challenge to his four-game suspension by the NFL is set to begin.

The star quarterback of the defending Super Bowl champions is expected to appeal by the deadline of 5 p.m. Thursday. The suspension was issued Monday for his part in the deflation of footballs below the league-mandated minimum for the AFC championship game.

His agent, Don Yee, said shortly after the suspension was announced that the appeal would be filed. The New England Patriots have not said if they'll appeal their penalty — a $1 million fine and the loss of a first-round draft pick next year and a fourth-rounder in 2017.

Yee has criticized the suspension that was based on a 243-page report of an investigation headed by NFL-appointee Ted Wells. On Tuesday, Wells was critical of Yee in a conference call with reporters.

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